Journal
NANO-MICRO LETTERS
Volume 6, Issue 4, Pages 307-315Publisher
SHANGHAI JIAO TONG UNIV PRESS
DOI: 10.1007/s40820-014-0003-7
Keywords
Cobalt ferrite; Graphene; Anode materials; Lithium ion battery
Funding
- Program of National Natural Science Foundation of China [21071097, 20901050]
- National Basic Research Program of China [2014CB239700]
- Shanghai Nano-Project [12 nm0503502]
- Minhang District Developing Project
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CoFe2O4-graphene nanosheets (CoFe2O4-GNSs) were synthesized through an ultrasonic method, and their electrochemical performances as Li-ion battery electrode were improved by annealing processes. The nanocomposites obtained at 350 degrees C maintained a high specific capacity of 1,257 mAh g(-1) even after 200 cycles at 0.1 A g(-1). Furthermore, the obtained materials also have better rate capability, and it can be maintained to 696, 495, 308, and 254 mAh g(-1) at 1, 2, 5, and 10 A g(-1), respectively. The enhancements realized in the reversible capacity and cyclic stability can be attributed to the good improvement in the electrical conductivity achieved by annealing at appropriate temperature, and the electrochemical nature of CoFe2O4 and GNSs during discharge-charge processes.
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